using System;

namespace NBitcoin.BouncyCastle.Crypto.Parameters
{
	internal class KeyParameter
		: ICipherParameters
	{
		private readonly byte[] key;

		public KeyParameter(
			byte[] key)
		{
			if (key == null)
				throw new ArgumentNullException(nameof(key));

			this.key = (byte[])key.Clone();
		}

		public KeyParameter(
			byte[] key,
			int keyOff,
			int keyLen)
		{
			if (key == null)
				throw new ArgumentNullException(nameof(key));
			if (keyOff < 0 || keyOff > key.Length)
				throw new ArgumentOutOfRangeException("keyOff");
			if (keyLen < 0 || (keyOff + keyLen) > key.Length)
				throw new ArgumentOutOfRangeException("keyLen");

			this.key = new byte[keyLen];
			Array.Copy(key, keyOff, this.key, 0, keyLen);
		}

		public byte[] GetKey()
		{
			return (byte[])key.Clone();
		}
	}

}
